Writing files in Java

I am going to show example which shows how to write a file in Java.
If you want to write some file you should start with FileOutputStream. This class is a concrete subclass of OutputStream.
Example:

package tutorial;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;public class Main{ public static void main(String[] args){ FileInputStream fileInputStream = null; FileOutputStream fileOutputStream = null; try{ String workingDirectory = System.getProperty("user.dir"); File fileDir = new File(workingDirectory,"src/tutorial"); File readFile = new File(fileDir,"Main.java"); File writeFile = new File(fileDir,"CopyFile"); fileInputStream = new FileInputStream(readFile);//  fileOutputStream = new FileOutputStream(writeFile,true); fileOutputStream = new FileOutputStream(writeFile); show(fileInputStream,fileOutputStream); } catch (IOException ex){ ex.printStackTrace(); } finally{ try{if (fileInputStream != null){fileInputStream.close();}  } catch (IOException ex){}  try{if (fileOutputStream != null){fileOutputStream.close();}  } catch (IOException ex){}  }  }  private static void show(FileInputStream fileInputStream,FileOutputStream fileOutputStream) throws IOException{ byte[] buffer = new byte[1024]; while (true){ int bytesRead = fileInputStream.read(buffer); if (bytesRead == -1){break; }  fileOutputStream.write(buffer,0,bytesRead); }  }}

I had commented code in line number 26.
This constructor lets you specify whether the file’s contents should be erased before data is written into it (append == false) or whether data is to be tacked onto the end of the file (append == true). You can uncomment this line and comment next line of code and you will see how content is added in the end of the file.